Improvement in hot-air furnaces



2 Sheets--Sheet I.

l. MAGEE.

Hut-Air Furnaces.

Patented Dec. 16, 1873.

4M. PHMU-UTHWHM HIC mm )fmsaomz's Macm) 2 Sheets--Sh eet 2. 1. MA G EE.

Hot-Air Furnaces.

Patented Dec. I6, 1873 i i 0 a UN TED STATES PATENT QFFIGE.

JOHN MAGEE, or CHELSEA, MASSACHUSETTS, ASSIGNOR To THE MAGEEQ I FURNACE COMPANY.

IMPROVEMENT I N HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 145,513, dated December 16,1873; application filed J one 30, 1873.

To all whom it may concern:

Be it known that I, JOHN MAGEE, of Chelsea, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings making part of this specification, in which- Figure 1 is a perspective view of the front of a furnace having my invention applied thereto. Fig. 2 is a vertical section.

To prevent the escape of gas into the furnace-room and its passage up into the various apartments of a building by the inadvertent opening of the furnace-door while the dampers are closed, and also to prevent this result when the dampers are open and a defective flue exists, is the object of m y present invention, which consists in a trunk provided with a damper placed immediately over the opening in the furnace-door, and connected with the ordinary pipe leading to the chimney-flue, the damper being pivoted within the opening at the lower end of the trunk, and being weighted or hung to one side of its center, so that it will rest upon or otherwise be connected with the door, and be closed when it is shut, and will instantly swing down so as to open when the door is opened, thereby allowing the gases,

, flame, and smoke from the fire to be drawn up the trunk and through its pipe to the chimney.

To enable others skilled in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is the portion of the outer-casing surrounding the cylindrical portion of the furnace, and B the top of the outer casing, both of which are formed of soap-stone or other suitable non-conducting material. C is the door controlling the open- ,ing a, through which fuel is admitted to the furnace, and b is a projection extending up from the door a hort distance above its top. D is a hollow trunk, the opening 0 at the bottom of which is situated immediately above this projection, and is provided with a damper, d, which is pivoted to one side of its center, in the sides of the bottom of the trunk, by which construction the damper will be unsupported, and will swing down so as to open the trunk when the door is open, the projection on the door, when it is closed, serving to throw up and hold the damper in a horizontal position, thus closing the opening at the bottom of the trunk. This trunk D is connected by a pipe, G, with the pipe E leading to the chimney-flue, and it will be evident from the fore going construction that should the furnacedoor be carelessly opened without previously opening the proper dampers in the pipe leading from the furnace to the chimney, or should the chimneyflue be temporarily or perma nently defective and the dampers in the pipe leading thereto be open, the act of swinging the furnace-door open will (through the connections above described) cause the damper in the trunk over it to instantly open and create a draft sufficient to carry up through the flues all gases, smoke, or flame, which otherwise might escape into the furnace-room and be carried into the various apartments of the house.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is-

A trunk placed above the door of a hot-air furnace, and provided with a damper which is opened and closed by the opening and closing of such door, substantially as and for the purpose described. I

Witness my hand this 24th day of June, A. D. 1873.

JOHN MAGEE. In presence of- N. W. STEARN W. J. CAMBRIDGE. 

